Re: [PATCH v2 0/2] iio: magnetometer: add support for Melexis MLX90393

[Nikhil Gautam <nikhilgtr@gmail.com>]

On 19-06-2026 12:29 am, Andy Shevchenko wrote:
> On Thu, Jun 18, 2026 at 09:31:39PM +0530, Nikhil Gautam wrote:
>> Hi,
>>
>> This series adds initial Industrial I/O subsystem support for the
>> Melexis MLX90393 3-axis magnetometer and temperature sensor.
>>
>> The MLX90393 supports both I2C and SPI interfaces. This series
>> implements support for the I2C interface while keeping the driver
>> structure transport-independent to simplify future SPI support.
>>
>> Currently supported features:
>>
>> * Raw magnetic field measurements for X/Y/Z axes
>> * Raw temperature measurements
>> * Configurable gain/scale selection
>> * Configurable oversampling ratio
>> * Direct mode operation through the IIO subsystem
>> * I2C interface support
>>
>> The driver has been tested on Raspberry Pi 5 hardware using an
>> MLX90393 sensor connected over I2C. Magnetic field and temperature
>> measurements were verified through the IIO sysfs interface.
> This doesn't answer to two important questions:
> - why do we need a brand new driver?
>    Can't one of the existing be updated to cover this HW?
>
> - where to find the datasheet? Any Links or other means to get it?

Hi Andy,

I looked at the existing magnetometer drivers in the IIO subsystem,
but none support the MLX90393 or a sufficiently similar register map and 
command protocol.
The MLX90393 uses its own command-based interface and device-specific 
configuration and conversion logic,
so extending an existing driver would require substantial changes with 
little code reuse.
Therefore, I chose to implement it as a separate driver.

The datasheet is publicly available from Melexis:
Link: 
https://media.melexis.com/-/media/files/documents/datasheets/mlx90393-datasheet-melexis.pdf

I'll include the datasheet link and clarify the rationale for introducing
a new driver in the cover letter of the next revision.

Thanks,
Nikhil